Grinding and polishing wheel.



No. 797.427. PATENTED AUG. 15, 1905. U. B. HARRIS.

GRINDING AND POLISHING WHEEL APPLIOATION FILED mm. 23, 1905.

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UNITED PATENT UFl TC,

CHAUNUEY E. HARRIS, OF BARRE, VERMON'I, ASSlGNOR TO SULLIVAN W. EMERSON, OF PLATTSBURG, NEW YORK.

GFilNDlNfB AND POLISHING WHEEL.

No. "rot/ 2? Specification of Letters Patent. U

Patented Aug. 15, 1905.

Application filed March 23, 1905. Serial No. 251,630.

To all whom, it may concern:

Be it known that 1, Grammar E. HARRIS, a citizen of the United States, residing at Barre, in the county of Washington and State of Vermont, have invented new and useful improvements in (urrinding and Polishing Wheels, of which the following is a specification.

This invention relates to grinding and polishing wheels designed especially for finishing and polishing blocks of granite and the like, and has for its objects to produce a comparatively simple inexpensive device of this character in which the emery or other abrasive material used in the polishing operation will be caused to act quickly and thoroughly -upon the surface under treatment and one wherein said grinding material will during the grinding operation be gradually drawn toward the center of the grinding-wheel.

A further object of the invention is to provide a device of this character in which the grinding members or segments are firmly but detachably secured to the body of the grinding-disk, thus permitting of their ready removal when worn to be replaced by new ones.

With these and other objects in view the invention comprises the novel features of construction and combination of parts more fully hereinafter described.

in the accompanying drawings, Figure 1 is a reverse plan view of a grinding and polishing wheel embodying the invention. Fig. 2 is a diametrical section centrally through the wheel.

Referring to the drawings, 1 designates the body of the wheel, preferably in the form of a circular disk composed of metal and having a central opening 2, on opposite sides of which is fixed a pair of projections or lugs 3, which extend from the normally upper face of the disk and are designed to be connected by the usual universal joint with the driving-shaft of the grinding apparatus.

Arranged upon the normally lower face of the head or disk 1 is a plurality of grinding members 4: of similar form and construction and each preferably of irregular crescent shape, as clearly seen in Fig. 1. Each segment has one of its ends longer andnarrower than the other and its widest portion between its ends rounded at one side of the center of the crescent, the inner ends of the segments being clustered around the central opening 2 in the head 1, while the outer tapered ends of the segments are curved in a line concentric with said' central opening and extend in a line subtantially parallel with the periphery of the head, thus serving to act upon the e1ncry or other abrasive material and draw the latter inward toward the center of the grinding or polishing wheel. The outer active faces of the segments are disposed in a common plane and have their forward edges beveled or undercut, as seen at 5, whereby the emery-dust will have a tendency to pass over the outer surface of and from one segment to another, thus to insure its perfect operation upon the block of granite or other body being operated upon. The segments 4% are rigidly but detachably secured to the head or disk 1, preferably by means of screws 6 or other suitable fastening devices, whereby the segments may when they become Worn or otherwise defective be readily removed and replaced by new ones.

The device as above described is especially adapted for grinding and polishing surfaces of blocks of granite or the like, and. owing to the particular shape and arrangement of the grinding members or segments a smooth even surface may be imparted to the granite in approximately one-half the time now required when operated upon by the grinding-scroll now in common use, it being noted in this connection that the grinding members, owing to their peculiar shape and arrangement, act in dependently of each other, while at the same time each segment receives and continues the grinding operation with the material escaping from beneath the preceding segment. it is to be observed that, as heretofore stated, the grinding material is also gradually worked inward toward the center of the disk, the speed of such movement of the material be ing, however, insuliicient to curtail the supply of grinding material at the outer portions of the segments, and, further, that owing to the outer portions of the grinding members operating with greater rapidity than their inner portions this inward feeding of the abrasive material insures a uniform grinding action throughout all parts of the segments and an increased speed in the grindingaction of the latter.

Having thus fully described the invention, what is claimed as new is- A grinding or polishing wheel comprising a body having aflat surface and a plurality of fed from one segment to another, substancrescent-shaped grinding-segments pro ected tially as described.

from said surface, each segment consisting of In testimony whereof I affix my signature in a long narrow tapering outer portion reachpresence of two witnesses.

ing to the periphery of the body and overlap- CHAUNOEY E. HARRIS ping the next LClJZLCBHl] segment lying 111 ad- Vance thereof, the corresponding advancing Witnesses:

edges of all the segments being" beveled or in- O. P. HOWE,

clined whereby the grinding material Will be BURT H. ELLS. 

